sd_session_is_activesystemdDeveloperLennartPoetteringlennart@poettering.netsd_session_is_active3sd_session_is_activesd_session_get_statesd_session_get_uidsd_session_get_seatsd_session_get_servicesd_session_get_typesd_session_get_classsd_session_get_displayDetermine state of a specific session#include <systemd/sd-login.h>int sd_session_is_activeconst char* sessionint sd_session_get_stateconst char* sessionchar** stateint sd_session_get_uidconst char* sessionuid_t* uidint sd_session_get_seatconst char* sessionchar** seatint sd_session_get_serviceconst char* sessionchar** serviceint sd_session_get_typeconst char* sessionchar** typeint sd_session_get_classconst char* sessionchar** classint sd_session_get_displayconst char* sessionchar** displayDescriptionsd_session_is_active() may
be used to determine whether the session identified by
the specified session identifier is currently active
(i.e. currently in the foreground and available for
user input) or not.sd_session_get_state() may
be used to determine the state of the session
identified by the specified session identifier. The
following states are currently known:
online (session logged in, but
session not active, i.e. not in the foreground),
active (session logged in and
active, i.e. in the foreground),
closing (session nominally logged
out, but some processes belonging to it are still
around). In the future additional states might be
defined, client code should be written to be robust in
regards to additional state strings being
returned. This function is a more generic version of
sd_session_is_active(). The returned
string needs to be freed with the libc
free3
call after use.sd_session_get_uid() may be
used to determine the user identifier of the Unix user the session
identified by the specified session identifier belongs
to.sd_session_get_seat() may
be used to determine the seat identifier of the seat
the session identified by the specified session
identifier belongs to. Note that not all sessions are
attached to a seat, this call will fail for them. The
returned string needs to be freed with the libc
free3
call after use.sd_session_get_service()
may be used to determine the name of the service (as
passed during PAM session setup) that registered the
session identified by the specified session
identifier. The returned string needs to be freed with
the libc
free3
call after use.sd_session_get_type() may
be used to determine the type of the session
identified by the specified session identifier. The
returned string is one of x11,
tty or
unspecified and needs to be freed
with the libc
free3
call after use.sd_session_get_class() may
be used to determine the class of the session
identified by the specified session identifier. The
returned string is one of user,
greeter or
lock-screen and needs to be freed
with the libc
free3
call after use.sd_session_get_display()
may be used to determine the X11 display of the
session identified by the specified session
identifier. The returned string is one of needs to be
freed with the libc
free3
call after use.If the session parameter of
any of these functions is passed as NULL the operation
is executed for the session the calling process is a
member of, if there is any.Return ValueIf the test succeeds
sd_session_is_active() returns a
positive integer, if it fails 0. On success
sd_session_get_state(),
sd_session_get_uid(),
sd_session_get_seat(),
sd_session_get_service(),
sd_session_get_type(),
sd_session_get_class() and
sd_session_get_display() return 0 or
a positive integer. On failure, these calls return a
negative errno-style error code.NotesThe sd_session_is_active(),
sd_session_get_state(),
sd_session_get_uid(),
sd_session_get_seat(),
sd_session_get_service(),
sd_session_get_type(),
sd_session_get_class() and
sd_session_get_display() interfaces
are available as shared library, which can be compiled
and linked to with the
libsystemd-loginpkg-config1
file.See Alsosystemd1,
sd-login7,
sd_pid_get_session3